<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      function myPromise() {
        return new Promise((resolve, reject) => {
          let num = Math.floor(Math.random() * 10) + 1;
          let flag = num > 5 ? true : false;
          if (flag) {
            resolve(flag + " good!");
          } else {
            reject(flag + " bad");
          }
        });
      }

      myPromise().then(res=>{
          console.log(res);
          return myPromise()
      }).then(res=>{
          console.log(res);
          return myPromise()
      }).catch(err=>{
          console.log(err);
        //   return myPromise()
      })
    </script>
  </body>
</html>
